Rock Identifier

Category

Sedimentary (Alluvial Deposit)

Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Alluvial Deposit) in the encyclopedia

Turbidite

Sapropel

Rock Gypsum

Rough Diamond (Pure Carbon (C)) — mineral

Rough Diamond

Pure Carbon (C)

Diamond (in a jewelry setting) (Carbon (C)) — mineral

Diamond (in a jewelry setting)

Carbon (C)

Diamond (specifically Blue Diamond color appearance) (Carbon (C) with trace Boron) — mineral

Diamond (specifically Blue Diamond color appearance)

Carbon (C) with trace Boron

Orange Quartzite / Carnelian Agate (Silicon Dioxide (SiO2)) — metamorphic

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)

Diamond (set in jewelry) (Carbon (C)) — mineral

Diamond (set in jewelry)

Carbon (C)

Diamond (in a jewelry setting) (Carbon (C)) — mineral

Diamond (in a jewelry setting)

Carbon (C)

Rough Diamond (Diamond (pure carbon, C)) — mineral

Rough Diamond

Diamond (pure carbon, C)

Diamond (C (Carbon)) — mineral

Diamond

C (Carbon)

Leopardite (Porphyritic Quartz Monzonite or Rhyolite) — igneous

Leopardite

Porphyritic Quartz Monzonite or Rhyolite

Possible calcite crystal fragment (Calcite (CaCO₃), tentative identification) — mineral

Possible calcite crystal fragment

Calcite (CaCO₃), tentative identification

Gold-Bearing River Sand (Auriferous Placer Sand (Au + various minerals like SiO2 and Fe3O4)) — sedimentary

Gold-Bearing River Sand

Auriferous Placer Sand (Au + various minerals like SiO2 and Fe3O4)

Chert (Flint variety) (Chert (SiO2)) — sedimentary

Chert (Flint variety)

Chert (SiO2)

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)) — metamorphic

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Garnet (Almandine) (Almandine (Fe3Al2(SiO4)3)) — mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Uncut diamond (likely gemstone) (Diamond — crystalline carbon, C) — gemstone

Uncut diamond (likely gemstone)

Diamond — crystalline carbon, C

Yellow Sapphire (Corundum (Al2O3:Fe)) — gemstone

Yellow Sapphire

Corundum (Al2O3:Fe)

Ruby (Corundum (Al2O3)) — mineral

Ruby

Corundum (Al2O3)

Garnet (specifically Almandine or Pyrope) (Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3) — mineral

Garnet (specifically Almandine or Pyrope)

Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3

Corundum (variety Ruby/Sapphire) (Aluminum Oxide (Al2O3)) — mineral

Corundum (variety Ruby/Sapphire)

Aluminum Oxide (Al2O3)

Blue Sapphire (Corundum (Al2O3 with trace Titanium and Iron)) — mineral

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Chrysoberyl (Cyclic Twin) (Beryllium Aluminum Oxide (BeAl2O4)) — mineral

Chrysoberyl (Cyclic Twin)

Beryllium Aluminum Oxide (BeAl2O4)

Gold (Gold (Native Au)) — mineral

Gold

Gold (Native Au)

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Raw ruby (corundum) (Ruby variety of corundum, aluminum oxide (Al₂O₃), colored chiefly by chromium) — gemstone

Raw ruby (corundum)

Ruby variety of corundum, aluminum oxide (Al₂O₃), colored chiefly by chromium

Rough Topaz (Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)) — mineral

Rough Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Likely polished garnet (Garnet group; probably almandine, iron-aluminum silicate (Fe₃Al₂Si₃O₁₂)) — gemstone

Likely polished garnet

Garnet group; probably almandine, iron-aluminum silicate (Fe₃Al₂Si₃O₁₂)

Yellow Sapphire (Corundum (Al2O3 with trace amounts of iron)) — gemstone

Yellow Sapphire

Corundum (Al2O3 with trace amounts of iron)

Gold Nugget (or Gold Grain) (Native Gold (Au)) — mineral

Gold Nugget (or Gold Grain)

Native Gold (Au)

Ruby (Corundum (Al2O3)) — mineral

Ruby

Corundum (Al2O3)

Blue Sapphire (Corundum (Al2O3) with iron and titanium impurities) — mineral

Blue Sapphire

Corundum (Al2O3) with iron and titanium impurities

Sapphire (Corundum (Al2O3)) — Mineral

Sapphire

Corundum (Al2O3)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

White Sapphire (Corundum (Al2O3)) — mineral

White Sapphire

Corundum (Al2O3)

Conglomerate (Sedimentary Conglomerate) — sedimentary

Conglomerate

Sedimentary Conglomerate

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate (pebble-to-cobble gravel) (Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix) — sedimentary

Conglomerate (pebble-to-cobble gravel)

Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix

Orange Sapphire (Corundum (Al2O3 with trace elements)) — gemstone

Orange Sapphire

Corundum (Al2O3 with trace elements)

Likely pyrite-bearing rock (Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix) — mineral

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Chalcedony (Common Agate) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Common Agate)

Silicon Dioxide (SiO₂)

Diamond (Native Carbon (C)) — mineral

Diamond

Native Carbon (C)